<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style>

@keyframes anim {
  20% {
    color: green;
  }
}

a {
  animation-name: anim;
  animation-duration: 40s;
}

</style>
<style>

:link { background: red ! important; }

</style>
</head>

<body onload="document.documentElement.style.border = 'initial';">
<div><a href="data:text/html,unlikely to be visited"></a></div>
</body>
</html>
